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vacuum flask

an insulating flask that has double walls, usually of silvered glass, with an evacuated space between them. It is used for maintaining substances at high or low temperatures Also called Thermos, Dewar flask
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Examples from the Web for vacuum flask
Historical Examples
  • I happened to have a vacuum flask and some sandwiches, and these I divided with him.

    The Golden Face William Le Queux
  • Spry took a vacuum flask from a cupboard, and left the cabin to fill it.

    Pincher Martin, O.D. H. Taprell Dorling
  • He put a vacuum flask in Jimmy's hand and turned to the others.

    Northwest! Harold Bindloss
  • I bent over him with an invalid's cup of liquid food prepared for this emergency, kept hot in a vacuum flask.

    Secret History Revealed By Lady Peggy O'Malley C. N. Williamson and A. M. Williamson

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